Practice window Appearing pattern
n1_1
1 		n1_2
2 		n1_3
3 		n1_4
4 		n2_1
1 		n2_2
2 		n2_3
3 		n2_4
4
n3_1
1 		n3_2
2 		n3_3
3 		n3_4
4 		n4_1
1 		n4_2
2 		n4_3
3 		n4_4
4
n5_1
1 		n5_2
2 		n5_3
3 		n5_4
4 		n6_1
1 		n6_2
2 		n6_3
3 		n6_4
4
n7_1
1 		n7_2
2 		n7_3
3 		n7_4
4 		n8_1
1 		n8_2
2 		n8_3
3 		n8_4
4
n9_1
1 		n9_2
2 		n9_3
3 		n9_4
4 		n10_1
1 		n10_2
2 		n10_3
3 		n10_4
4
n15_1
1 		n15_2
2 		n15_3
3 		n15_4
4
n11_1
1 		n11_2
2 		n11_3
3 		n11_4
4 		n12_1
1 		n12_2
2 		n12_3
3 		n12_4
4
n13_1
1 		n13_2
2 		n13_3
3 		n13_4
4 		n14_1
1 		n14_2
2 		n14_3
3 		n14_4
4
n16_1
1 		n16_2
2 		n16_3
3 		n16_4
4 		n19_1
1 		n19_2
2 		n19_3
3 		n19_4
4
n17_1
1 		n17_2
2 		n17_3
3 		n17_4
4 		n18_1
1 		n18_2
2 		n18_3
3 		n18_4
4
n20_1
1 		n20_2
2 		n20_3
3 		n20_4
4 		n21_1
1 		n21_2
2 		n21_3
3 		n21_4
4